Why have I never seen the weather forecast of CCTV? It never exceeds 40 degrees. But some of the temperatures I measured myself even exceeded 42 degrees. Why is this?

The temperature measured by CCTV weather forecast: the thermometer must be placed in a louver, and it should be 1.5m above the ground, because the air change at this height is relatively stable, and it is also the height of human activities, which is more practical. The data of the thermometer in the shutter is the standard of daily temperature.

Why must the temperature be based on the temperature in the blinds? First of all, this standard is a unified international observation standard at present, and the data observed according to this standard should participate in the data exchange of the World Meteorological Organization. If the standards are not unified, the exchanged data will not be comparable, and the meteorological department will not be able to make accurate forecasts accordingly. When the meteorological department issues a high-temperature warning signal, the highest temperature in the louver reaches above 35℃, which means that the highest temperature in other areas may reach 40℃ or even higher, which mainly depends on environmental conditions such as ground conditions, ventilation and direct sunlight. Therefore, the highest temperature in the observation field is more practical for the public. "